<template>
  <div class="list" ref="wrapper">
   <div> 
    <div class="area">
      <div class="title border-topbottom">当前城市</div>
      <div class="button-list">
        <div class="button-wrapper">
          <div class="button">{{this.currentCity}}</div>
        </div>
      </div>
    </div>
    
   <div class="area">
      <div class="title border-topbottom">热门城市</div>
      <div class="button-list">
        <div
          class="button-wrapper" 
          v-for="item of hot"
          :key="item.id"
          @click="handleCityClick(item.name)"
        >
          <div class="button">{{item.name}}</div>
        </div>
      </div>
    </div>
    <div 
       class="area" 
       v-for="(item, key) of cities" 
       :key="key"
       :ref="key"
    >
      <div class="title border-topbottom">{{key}}</div>
      <div class="item-list">
        <div 
          class="item border-bottom"
          v-for="innerItem of item"
          :key="innerItem.id"
          @click="handleCityClick(innerItem.name)"
        >
          {{innerItem.name}}
        </div>
      </div>
    </div>
   </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    handleCityClick (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  }
}   
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0         
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
     .button-list
      overflow:hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem      
</style>








